Shoe machine



J. SANDT SHOE MACHINE April 8, 1930.

Filed April 12, 1929 2 Sheets-Sheet l J. SAND SHOE MACHINE Aprilv 1930.

Filed April 12, 1929 2 Sheets-Sheet 2 Patented Apr. 8, 1930 UNITED STATES JULIUS SAND'I, F PIRMASENS, GERMANY SHOE MACHINE Application filed. April 12, 1929, Serial No. 354,563, and i i-Germany April 3,1928

This invention relates to shoe-machines having heated swinging tools and more especially to machines for burnishing the edges of the soles.

The object of the invention is to provide improved means for heating the tools of such machines by heated air.

The invention consists in the arrangement of means for forcing a heated air stream against the tools of the machine.

An important feature of the invention lies in the provision of a fan for producing a stream of compressed air which is heated and blown against the tools.

Another feature of importance' is comprised in the arrangement of the fan on the shaft of the electromotor driving the machine.

Another important feature resides in the arrangement that the air is sucked through the electromotor before it is led over the heating elements thus cooling the electromotor and becoming itself preheated. Other features of the invention including important details of construction and combinations of parts will be hereinafter more particularly described and claimed.

The following figures serve for illustration of an exampleof an embodiment of the invention.

Fig. 1 shows the head of the edge-polishing machine partly in an elevation and partly in a. section.

Fig. 2 is a section along the line y@ of Fig. 1 some parts of the machine-head being omitted.

Fig. 3 is a section through the heating pipe and the nozzles for the outflowing heated air.

Fig. 4 is a section on the line w-w of Fig. 3.

Fig. 5 shows the swinging tool as seen from the back-side.

Fig. 6 is a section of the swingingtool on the line zz of Fig. 5.

The shaft 1 of the electromotor 17 is journaled in the machine-head 9 and carries at its lower end an inclined disk 18. The rollers of the arms 20 are held in contact with the disk 18 by the spring 21. The arms 20 arranged within the head 9 are fastened to the two horizontal and parallel shafts 22. On the the atmosphere by another pipe 5".

pipes 5 end into nozzles 6 which direct the front and rear ends of these shafts are clamped outside of the head 9 the polishing tools or other swinging tools 7. To the upper end of the motor shaft 1 a fan 2 is fastened. The fresh air entering at 3 is'forced by centrifugal force through the spiral housing 3 and the leads 4 into the horizontal heating pipes 5. The temperature of the heated airstream can be regulated by admitting of fresh air through the openings of the rotatable valves 1. i The heating pipes 5 (Fig. 3) are surrounded by air-cushion 5 which is separated from The heated air-stream against the ribs 7' of the swinging tool 7 (Figs. 5 and 6). The whole heating device is carried by the sockets 8 fastened to the ribs 9 of the machine-head 9. The leads 10 of the electric current come through insulating nipples 11, from an electric switch or from a resistance coil arranged within the machine-frame and connected to the source of electricity. The leads enter the heating pipe through the nipples 12. The heating spirals 13, 13 are wound around an insulator 14: towards both ends of the heating pipe where they are connected by an insulated metallic core. The insulator 14 is held against the inner wall. of the pipe 5 by crosslike ribs 15. 7

What I claim is:

1. In a shoe-machine of the class described, a tool operating upon a shoe, means for heating air, means for heating the tool by the heated air, an electromotor driving the machine, and means allowing the air' to flow through the electromotor before reaching the means for heating the air. I

2. In ashoe-machine of the class described, a tool operating upon a. shoe, means for heating air, means for heating the tool by the heated air, a fan for forcing the air towards the tool, an electromotor driving the machine and the fan, and means allowing the air to fiow through the electromotor before reaching the means for heating the air.

3. A shoe-machine having in combination, a swinging shaft carrying working tools, an electromotor for driving the machine and arranged with its axis in a plane perpendicular to the swinging shaft, means for heating the tools by heated air, and means driven by the electromotor for forcing the air towards the tools.

4. A shoe-machine having in combination, two parallel swinging shafts carrying the working tools, an electromotor for swinging both shafts arranged in the middle between and with its axis in a plane perpendicular to the shafts, means for heating the tools by heated air, and means driven by the electromotor for forcing the air towards the tools.

In testimony whereof I affix my signature.

JULIUS SANDT. 

